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Finding the Fourth Proportional to 390,813.60, 586,105.20 and 154,077.60

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Solution

The fourth proportional to 390,813.60, 586,105.20 and 154,077.60 is: 231,070.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,813.60 : 586,105.20 = 154,077.60 : x
  2. Step 2: Convert to fraction form
    390,813.60/586,105.20 = 154,077.60/x
  3. Step 3: Cross multiply
    390,813.60x = 586,105.20 × 154,077.60
  4. Step 4: Simplify right side
    390,813.60x = 90,305,682,563.52
  5. Step 5: Solve for x
    x = 90,305,682,563.52/390,813.60
  6. Step 6: Final answer
    x = 231,070.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.